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Mdoc fixes and clarification.

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Submitted by: sheldonh
This commit is contained in:
Jonathan Lemon 2001-10-25 05:53:11 +00:00
parent cce33f59e8
commit 06279b5357
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=85464
1 changed files with 29 additions and 20 deletions
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49
sbin/conscontrol/conscontrol.8
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@ -33,31 +33,39 @@
.Nd control physical console devices
.Sh SYNOPSIS
.Nm
.Op list
.Op Cm list
.Nm
.Ic mute
.Ar on|off
.Cm mute on | off
.Nm
.Ic add|delete
.Cm add | delete
.Ar console
.Sh DESCRIPTION
.Nm Conscontrol
is used to examine and modify the physical devices which back
The
.Nm
utility is used to examine and modify the physical devices which back
the virtual console console devices.
If no arguments are specified
If no arguments
(or only the
.Ar list
argument),
.Cm list
command)
are specified,
the current console settings are shown.
.Pp
There are two types of logical consoles; a high level console which
is represented by /dev/console, and a low level console.
The low level console is used for kernel printfs and debugger support,
while the high level console is used by user programs like syslog.
Multiple device support is implemented only for the low level console,
is represented by
.Pa /dev/console , and a low level console.
The low level console is used for kernel
.Xr printf 9
and
.Xr ddb 4
debugger support,
while the high level console is used by user programs like
.Xr syslogd 8 .
Multiple device support is implemented only for the low level console;
the high level console is set to the first device in the console list.
.Pp
Multiple console support may be invoked by passing the kernel the
.\" XXX The Fl macro doesn't really apply here
-D
flag from the boot loader, or by using
.Nm
@ -65,23 +73,24 @@ to change the list of console devices after the system has booted.
.Pp
The following options are available:
.Bl -tag -width indent
.It Cm add|delete Ar console
.It Cm add | delete Ar console
Add or delete a physical device from the logical console.
The device must support low-level console operations.
Adding a device will place it at the front of the list of console
devices; the first device is used for the high level console.
.It Cm mute Ar on|off
Change the state of the console muting.
.It Cm mute Cm on | off
Change the state of console muting.
All console output is suppressed when console muting is on.
.El
.Sh SEE ALSO
.Xr boot 8 ,
.Xr loader 8 ,
.Xr sio 4 ,
.Xr syscons 4
.Xr syscons 4 ,
.Xr boot 8 ,
.Xr loader 8
.Sh HISTORY
The
.Nm
command first appeared in
.Fx 4.5 .
.Fx 5.0 .
.Sh AUTHORS
.An Jonathan Lemon